- A
Use EFS One Zone storage class with a single mount target in the same Availability Zone as the application.
Why wrong: One Zone and single mount target provide no HA and limited latency.
- B
Use EFS Standard storage class with Multi-AZ and create a single mount target in one Availability Zone.
Why wrong: Single mount target creates a single point of failure.
- C
Use EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone.
Standard storage is replicated across AZs; mount targets in each AZ provide low latency.
- D
Use EFS One Zone storage class and create mount targets in each Availability Zone.
Why wrong: One Zone storage is not highly available.
Question 1,566 of 1,705
EFS Multi-AZ Deployment for High Availability and Low Latency
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a VPC with multiple subnets across three Availability Zones. They are deploying an NFS file system using Amazon EFS. They need high availability and low latency from all subnets. Which EFS deployment option meets these requirements?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone.
Option C is correct because the EFS Standard storage class provides Multi-AZ durability and availability, and creating mount targets in each Availability Zone ensures that EC2 instances in any subnet can connect to EFS with low latency by using a mount target in the same AZ. This architecture avoids cross-AZ data transfer charges and minimizes latency, meeting both high availability and low latency requirements.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use EFS One Zone storage class with a single mount target in the same Availability Zone as the application.
Why it's wrong here
One Zone and single mount target provide no HA and limited latency.
- ✗
Use EFS Standard storage class with Multi-AZ and create a single mount target in one Availability Zone.
Why it's wrong here
Single mount target creates a single point of failure.
- ✓
Use EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone.
Why this is correct
Standard storage is replicated across AZs; mount targets in each AZ provide low latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use EFS One Zone storage class and create mount targets in each Availability Zone.
Why it's wrong here
One Zone storage is not highly available.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that creating mount targets in every AZ alone guarantees high availability, but the storage class must also be Multi-AZ (Standard) to replicate data across AZs; otherwise, a single-AZ failure can cause data loss.
Detailed technical explanation
How to think about this question
EFS uses NFSv4.1 protocol, and mount targets are elastic network interfaces (ENIs) in a VPC subnet with a specific IP address. When a mount target exists in each AZ, the EFS client automatically uses the mount target in the same AZ (via DNS resolution that returns AZ-specific IPs), ensuring data path stays within the AZ. The EFS Standard storage class replicates data across three AZs, providing 99.99% availability and 99.999999999% durability, while One Zone offers only 99.999999999% durability within a single AZ.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone. — Option C is correct because the EFS Standard storage class provides Multi-AZ durability and availability, and creating mount targets in each Availability Zone ensures that EC2 instances in any subnet can connect to EFS with low latency by using a mount target in the same AZ. This architecture avoids cross-AZ data transfer charges and minimizes latency, meeting both high availability and low latency requirements.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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